Bendy-Bus Primal in the art picture.
Bendy-Bus Primal was not alive when created when Zetar (BW) saw him being built, but a part of the Allspark that fell down a air suction vent and went right into the chest chamber that made him immediately have a spark. It is not related to the ROTF character. His beast mode is an Ultrasaurus.
Bendy-Bus Primal in beast mode.